Update print preview test to not use CallJavascriptFunctionUnsafe

chrome/browser/ui/webui/print_preview/print_preview_handler.h

Index: chrome/browser/ui/webui/print_preview/print_preview_handler.h
diff --git a/chrome/browser/ui/webui/print_preview/print_preview_handler.h b/chrome/browser/ui/webui/print_preview/print_preview_handler.h
index 34725e3ab04c4df43c1687b63a2bc422dd10ec5f..bca77f53281ade07fc0b7f6716f7108ae8559498 100644
--- a/chrome/browser/ui/webui/print_preview/print_preview_handler.h
+++ b/chrome/browser/ui/webui/print_preview/print_preview_handler.h
@@ -116,6 +116,12 @@ class PrintPreviewHandler
   // Sets |pdf_file_saved_closure_| to |closure|.
   void SetPdfSavedClosureForTesting(const base::Closure& closure);
 
+  // Fires the 'enable-manipulate-settings-for-test' WebUI event.
+  void SendEnableManipulateSettingsForTest();
+
+  // Fires the 'manipulate-settings-for-test' WebUI event with |settings|.
+  void SendManipulateSettingsForTest(const base::DictionaryValue& settings);
+
  protected:
   // If |prompt_user| is true, starts a task to create the default Save As PDF
   // directory if needed. OnDirectoryCreated() will be called when it